Christine,
You can get it at two places:
http://www.microsoftstore.com/store/...ctID.253736200
http://www.journeyed.com/item/Micros...intosh/1534115
Office 365 is $100/year for a subscription to get Office 2011:Mac anyway, so I wouldn't go for it.
Talk with your school district's IT department. You may have a Home Use program where you get it for a lot less (potentially free) as an employee.
You can disable the Start Menu in Windows 8.1 and replace it with a third-party program, but the problem is you can't make it go completely away. One swipe of the touchpad or screen and you're right back at it.
In terms of Mac laptops, until they come out with a Retina MacBook Air, the Pro is the best choice. It's really fast, and will last a few years. Right now, it's the best portable they have.